Question

A coagulant is:

• A. special chemical which helps small fine particles to settle down
• B. which helps the substance to sublime
• C. filtering agent
• D. none of the above

Answer 1

The correct option is A special chemical which helps small fine particles to settle down

This is an inorganic or organic substance that initiates or aids a congealing process during water treatment. A coagulant, together with other chemicals, are added in water to aggregate dissolved contaminants and tiny particles into larger particles so that filtration, clarification, or any other solid removal process may be used to remove them. Inorganic coagulants, except the sodium aluminate (which is basic), decrease alkalinity levels in water. This helps to reduce risks of corrosion attack in pipes transporting wastewater.